How long does a knee replacement last, and what affects its lifespan?
A knee replacement can last many years, often around twenty years or longer, but individual lifespan varies and cannot be guaranteed. Health, activity, weight, infection and implant stability matter. Robotic assistance alone does not guarantee a longer-lasting joint.
Details
Why revision may be needed
Wear, loosening, instability, infection or a fracture around the implant can require further surgery. Pain after replacement does not automatically mean implant failure, but persistent or worsening pain needs assessment. Published longevity estimates depend on the implant, patients and follow-up period.
Protecting the result
Follow rehabilitation and review plans, maintain muscle strength and a suitable weight, and choose activities agreed with the team. Tell clinicians about the implant when infections or new problems are assessed. Do not self-prescribe preventive antibiotics.
Warning signs
Increasing pain with redness, warmth, wound drainage or fever warrants urgent contact. Sudden leg swelling needs assessment; chest pain or breathlessness requires emergency care. Do not wait for an implant’s expected lifespan to expire before reporting problems.
Related reading: Is robot-assisted knee replacement better than conventional surgery?.